ShopTalk: Batteries for Power Devices

[MYKEYGOLF]

Al T and All,
Do any of you guys have a reliable source for reasonably priced batteries for power drills etc. I have mostly Sears stuff -- who knows who made it. The batteries are done for and I am trying to find if replacements are in order or if the equipment goes in the trash.
I guess in the same light then what do you all use for these devices. I love the portable stuff because it is so convenient. But if every battery is like $40 then maybe cords are not so bad.
Inkind,
MyKey